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• ()

  is an open-source column-oriented DBMS (columnar database management system) for online analytical processing (OLAP).

  ClickHouse was developed by the Russian IT company Yandex for the Yandex.Metrica web analytics service.

• OLAP

  Online analytical processing () is an approach to answer multi-dimensional analytical (MDA) queries swiftly in computing.

  OLAP is part of the broader category of business intelligence, which also encompasses relational databases, report writing and data mining.

• MDA

  Multidimensional analysis () is a data analysis process that groups data into two categories: data dimensions and measurements.

  In many disciplines, two-dimensional data sets are also called panel data.

• Yandex

  is a Russion Dutch-domiciled multinational corporation providing Internet-related products and services, including transportation, search and information services, eCommerce, nacigation, mobile applications, and online advertising. They provide over 70 services.

  It is the 5th largest search engine worldwide after Google, Baidu, Bing, and Yahoo!.

• is a free web analytics service(like ) offered by Yandex that tracks and reports website traffic.

  Yandex launched the service in 2008 and made it public in 2009.

• Tutorial